A persistent sore on the tongue that doesn't heal completely for more than a month should be evaluated by a healthcare professional, preferably a dentist or oral surgeon. There can be various causes for such a sore, and while cancer is one possibility, it is important not to jump to conclusions without a proper examination. Other potential causes of persistent tongue sores include: Trauma or injury: Tongue biting or irritation from sharp or rough teeth or dental restorations can lead to persistent sores. Infections: Fungal, viral, or bacterial infections can cause tongue sores that may take time to heal. Oral ulcers: Aphthous ulcers, also known as canker sores, can develop on the tongue and may take several weeks to heal. Oral lichen planus: This is a chronic inflammatory condition that can affect the tongue and other areas of the mouth. It is crucial for your mother to see a healthcare professional for a proper evaluation, which may include a physical examination and, if necessary, a biopsy of the sore. This will help determine the exact cause and appropriate treatment.

1 - if any injury to tongue while eating or bushing then it should heal within two weeks. 2 - if repeat injury happens then blood may come 3 - so better is to wait for two more weeks 4 - maintain good oral hyegiene 5 - if after it it is not healing then consul Oral surgeon for further investigation.

You need to get it physically examined by the dentist , by simply looking at the picture one can not declare anything.

Hello Get physically examined ,as it's for more than a month

Hello Get it check physically with oral maxillofacial surgeon